text: /*
   *  Amiga Linux/m68k Ariadne Ethernet Driver
   *
   *  © Copyright 1995-2003 by Geert Uytterhoeven (geert@linux-m68k.org)
   *			     Peter De Schrijver (p2@mind.be)
   *
   *  ---------------------------------------------------------------------------
   *
   *  This program is based on
   *
   *	lance.c:	An AMD LANCE ethernet driver for linux.
   *			Written 1993-94 by Donald Becker.
   *
   *	Am79C960:	PCnet(tm)-ISA Single-Chip Ethernet Controller
   *			Advanced Micro Devices
   *			Publication #16907, Rev. B, Amendment/0, May 1994
   *
   *	MC68230:	Parallel Interface/Timer (PI/T)
   *			Motorola Semiconductors, December, 1983
   *
   *  ---------------------------------------------------------------------------
   *
   *  This file is subject to the terms and conditions of the GNU General Public
   *  License.  See the file COPYING in the main directory of the Linux
   *  distribution for more details.
   *
   *  ---------------------------------------------------------------------------
   *
   *  The Ariadne is a Zorro-II board made by Village Tronic. It contains:
   *
   *	- an Am79C960 PCnet-ISA Single-Chip Ethernet Controller with both
   *	  10BASE-2 (thin coax) and 10BASE-T (UTP) connectors
   *
   *	- an MC68230 Parallel Interface/Timer configured as 2 parallel ports
   */
  
  #include <linux/module.h>
  #include <linux/stddef.h>
  #include <linux/kernel.h>
  #include <linux/string.h>
  #include <linux/errno.h>
  #include <linux/ioport.h>
  #include <linux/netdevice.h>
  #include <linux/etherdevice.h>
  #include <linux/interrupt.h>
  #include <linux/skbuff.h>
  #include <linux/init.h>
  #include <linux/zorro.h>
  #include <linux/bitops.h>
  
  #include <asm/amigaints.h>
  #include <asm/amigahw.h>
  #include <asm/irq.h>
  
  #include "ariadne.h"
  
  
  #ifdef ARIADNE_DEBUG
  int ariadne_debug = ARIADNE_DEBUG;
  #else
  int ariadne_debug = 1;
  #endif
  
  
      /*
       *	Macros to Fix Endianness problems
       */
  
  				/* Swap the Bytes in a WORD */
  #define swapw(x)	(((x>>8)&0x00ff)|((x<<8)&0xff00))
  				/* Get the Low BYTE in a WORD */
  #define lowb(x)		(x&0xff)
  				/* Get the Swapped High WORD in a LONG */
  #define swhighw(x)	((((x)>>8)&0xff00)|(((x)>>24)&0x00ff))
  				/* Get the Swapped Low WORD in a LONG */
  #define swloww(x)	((((x)<<8)&0xff00)|(((x)>>8)&0x00ff))
  
  
      /*
       *	Transmit/Receive Ring Definitions
       */
  
  #define TX_RING_SIZE	5
  #define RX_RING_SIZE	16
  
  #define PKT_BUF_SIZE	1520
  
  
      /*
       *	Private Device Data
       */
  
  struct ariadne_private {
      volatile struct TDRE *tx_ring[TX_RING_SIZE];
      volatile struct RDRE *rx_ring[RX_RING_SIZE];
      volatile u_short *tx_buff[TX_RING_SIZE];
      volatile u_short *rx_buff[RX_RING_SIZE];
      int cur_tx, cur_rx;			/* The next free ring entry */
      int dirty_tx;			/* The ring entries to be free()ed. */
      char tx_full;
  };
  
  
      /*
       *	Structure Created in the Ariadne's RAM Buffer
       */
  
  struct lancedata {
      struct TDRE tx_ring[TX_RING_SIZE];
      struct RDRE rx_ring[RX_RING_SIZE];
      u_short tx_buff[TX_RING_SIZE][PKT_BUF_SIZE/sizeof(u_short)];
      u_short rx_buff[RX_RING_SIZE][PKT_BUF_SIZE/sizeof(u_short)];
  };
  
  static int ariadne_open(struct net_device *dev);
  static void ariadne_init_ring(struct net_device *dev);
  static netdev_tx_t ariadne_start_xmit(struct sk_buff *skb,
  				      struct net_device *dev);
  static void ariadne_tx_timeout(struct net_device *dev);
  static int ariadne_rx(struct net_device *dev);
  static void ariadne_reset(struct net_device *dev);
  static irqreturn_t ariadne_interrupt(int irq, void *data);
  static int ariadne_close(struct net_device *dev);
  static struct net_device_stats *ariadne_get_stats(struct net_device *dev);
  static void set_multicast_list(struct net_device *dev);
  
  
  static void memcpyw(volatile u_short *dest, u_short *src, int len)
  {
      while (len >= 2) {
  	*(dest++) = *(src++);
  	len -= 2;
      }
      if (len == 1)
  	*dest = (*(u_char *)src)<<8;
  }
  
  
  static int __devinit ariadne_init_one(struct zorro_dev *z,
  				      const struct zorro_device_id *ent);
  static void __devexit ariadne_remove_one(struct zorro_dev *z);
  
  
  static struct zorro_device_id ariadne_zorro_tbl[] __devinitdata = {
      { ZORRO_PROD_VILLAGE_TRONIC_ARIADNE },
      { 0 }
  };
  MODULE_DEVICE_TABLE(zorro, ariadne_zorro_tbl);
  
  static struct zorro_driver ariadne_driver = {
      .name	= "ariadne",
      .id_table	= ariadne_zorro_tbl,
      .probe	= ariadne_init_one,
      .remove	= __devexit_p(ariadne_remove_one),
  };
  
  static const struct net_device_ops ariadne_netdev_ops = {
  	.ndo_open		= ariadne_open,
  	.ndo_stop		= ariadne_close,
  	.ndo_start_xmit		= ariadne_start_xmit,
  	.ndo_tx_timeout		= ariadne_tx_timeout,
  	.ndo_get_stats		= ariadne_get_stats,
  	.ndo_set_multicast_list	= set_multicast_list,
  	.ndo_validate_addr	= eth_validate_addr,
  	.ndo_change_mtu		= eth_change_mtu,
  	.ndo_set_mac_address	= eth_mac_addr,
  };
  
  static int __devinit ariadne_init_one(struct zorro_dev *z,
  				      const struct zorro_device_id *ent)
  {
      unsigned long board = z->resource.start;
      unsigned long base_addr = board+ARIADNE_LANCE;
      unsigned long mem_start = board+ARIADNE_RAM;
      struct resource *r1, *r2;
      struct net_device *dev;
      struct ariadne_private *priv;
      int err;
  
      r1 = request_mem_region(base_addr, sizeof(struct Am79C960), "Am79C960");
      if (!r1)
  	return -EBUSY;
      r2 = request_mem_region(mem_start, ARIADNE_RAM_SIZE, "RAM");
      if (!r2) {
  	release_mem_region(base_addr, sizeof(struct Am79C960));
  	return -EBUSY;
      }
  
      dev = alloc_etherdev(sizeof(struct ariadne_private));
      if (dev == NULL) {
  	release_mem_region(base_addr, sizeof(struct Am79C960));
  	release_mem_region(mem_start, ARIADNE_RAM_SIZE);
  	return -ENOMEM;
      }
  
      priv = netdev_priv(dev);
  
      r1->name = dev->name;
      r2->name = dev->name;
  
      dev->dev_addr[0] = 0x00;
      dev->dev_addr[1] = 0x60;
      dev->dev_addr[2] = 0x30;
      dev->dev_addr[3] = (z->rom.er_SerialNumber>>16) & 0xff;
      dev->dev_addr[4] = (z->rom.er_SerialNumber>>8) & 0xff;
      dev->dev_addr[5] = z->rom.er_SerialNumber & 0xff;
      dev->base_addr = ZTWO_VADDR(base_addr);
      dev->mem_start = ZTWO_VADDR(mem_start);
      dev->mem_end = dev->mem_start+ARIADNE_RAM_SIZE;
  
      dev->netdev_ops = &ariadne_netdev_ops;
      dev->watchdog_timeo = 5*HZ;
  
      err = register_netdev(dev);
      if (err) {
  	release_mem_region(base_addr, sizeof(struct Am79C960));
  	release_mem_region(mem_start, ARIADNE_RAM_SIZE);
  	free_netdev(dev);
  	return err;
      }
      zorro_set_drvdata(z, dev);
  
      printk(KERN_INFO "%s: Ariadne at 0x%08lx, Ethernet Address %pM\n",
             dev->name, board, dev->dev_addr);
  
      return 0;
  }
  
  
  static int ariadne_open(struct net_device *dev)
  {
      volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
      u_short in;
      u_long version;
      int i;
  
      /* Reset the LANCE */
      in = lance->Reset;
  
      /* Stop the LANCE */
      lance->RAP = CSR0;		/* PCnet-ISA Controller Status */
      lance->RDP = STOP;
  
      /* Check the LANCE version */
      lance->RAP = CSR88;		/* Chip ID */
      version = swapw(lance->RDP);
      lance->RAP = CSR89;		/* Chip ID */
      version |= swapw(lance->RDP)<<16;
      if ((version & 0x00000fff) != 0x00000003) {
  	printk(KERN_WARNING "ariadne_open: Couldn't find AMD Ethernet Chip\n");
  	return -EAGAIN;
      }
      if ((version & 0x0ffff000) != 0x00003000) {
  	printk(KERN_WARNING "ariadne_open: Couldn't find Am79C960 (Wrong part "
  	       "number = %ld)\n", (version & 0x0ffff000)>>12);
  	return -EAGAIN;
      }
  #if 0
      printk(KERN_DEBUG "ariadne_open: Am79C960 (PCnet-ISA) Revision %ld\n",
  	   (version & 0xf0000000)>>28);
  #endif
  
      ariadne_init_ring(dev);
  
      /* Miscellaneous Stuff */
      lance->RAP = CSR3;		/* Interrupt Masks and Deferral Control */
      lance->RDP = 0x0000;
      lance->RAP = CSR4;		/* Test and Features Control */
      lance->RDP = DPOLL|APAD_XMT|MFCOM|RCVCCOM|TXSTRTM|JABM;
  
      /* Set the Multicast Table */
      lance->RAP = CSR8;		/* Logical Address Filter, LADRF[15:0] */
      lance->RDP = 0x0000;
      lance->RAP = CSR9;		/* Logical Address Filter, LADRF[31:16] */
      lance->RDP = 0x0000;
      lance->RAP = CSR10;		/* Logical Address Filter, LADRF[47:32] */
      lance->RDP = 0x0000;
      lance->RAP = CSR11;		/* Logical Address Filter, LADRF[63:48] */
      lance->RDP = 0x0000;
  
      /* Set the Ethernet Hardware Address */
      lance->RAP = CSR12;		/* Physical Address Register, PADR[15:0] */
      lance->RDP = ((u_short *)&dev->dev_addr[0])[0];
      lance->RAP = CSR13;		/* Physical Address Register, PADR[31:16] */
      lance->RDP = ((u_short *)&dev->dev_addr[0])[1];
      lance->RAP = CSR14;		/* Physical Address Register, PADR[47:32] */
      lance->RDP = ((u_short *)&dev->dev_addr[0])[2];
  
      /* Set the Init Block Mode */
      lance->RAP = CSR15;		/* Mode Register */
      lance->RDP = 0x0000;
  
      /* Set the Transmit Descriptor Ring Pointer */
      lance->RAP = CSR30;		/* Base Address of Transmit Ring */
      lance->RDP = swloww(ARIADNE_RAM+offsetof(struct lancedata, tx_ring));
      lance->RAP = CSR31;		/* Base Address of transmit Ring */
      lance->RDP = swhighw(ARIADNE_RAM+offsetof(struct lancedata, tx_ring));
  
      /* Set the Receive Descriptor Ring Pointer */
      lance->RAP = CSR24;		/* Base Address of Receive Ring */
      lance->RDP = swloww(ARIADNE_RAM+offsetof(struct lancedata, rx_ring));
      lance->RAP = CSR25;		/* Base Address of Receive Ring */
      lance->RDP = swhighw(ARIADNE_RAM+offsetof(struct lancedata, rx_ring));
  
      /* Set the Number of RX and TX Ring Entries */
      lance->RAP = CSR76;		/* Receive Ring Length */
      lance->RDP = swapw(((u_short)-RX_RING_SIZE));
      lance->RAP = CSR78;		/* Transmit Ring Length */
      lance->RDP = swapw(((u_short)-TX_RING_SIZE));
  
      /* Enable Media Interface Port Auto Select (10BASE-2/10BASE-T) */
      lance->RAP = ISACSR2;	/* Miscellaneous Configuration */
      lance->IDP = ASEL;
  
      /* LED Control */
      lance->RAP = ISACSR5;	/* LED1 Status */
      lance->IDP = PSE|XMTE;
      lance->RAP = ISACSR6;	/* LED2 Status */
      lance->IDP = PSE|COLE;
      lance->RAP = ISACSR7;	/* LED3 Status */
      lance->IDP = PSE|RCVE;
  
      netif_start_queue(dev);
  
      i = request_irq(IRQ_AMIGA_PORTS, ariadne_interrupt, IRQF_SHARED,
                      dev->name, dev);
      if (i) return i;
  
      lance->RAP = CSR0;		/* PCnet-ISA Controller Status */
      lance->RDP = INEA|STRT;
  
      return 0;
  }
  
  
  static void ariadne_init_ring(struct net_device *dev)
  {
      struct ariadne_private *priv = netdev_priv(dev);
      volatile struct lancedata *lancedata = (struct lancedata *)dev->mem_start;
      int i;
  
      netif_stop_queue(dev);
  
      priv->tx_full = 0;
      priv->cur_rx = priv->cur_tx = 0;
      priv->dirty_tx = 0;
  
      /* Set up TX Ring */
      for (i = 0; i < TX_RING_SIZE; i++) {
  	volatile struct TDRE *t = &lancedata->tx_ring[i];
  	t->TMD0 = swloww(ARIADNE_RAM+offsetof(struct lancedata, tx_buff[i]));
  	t->TMD1 = swhighw(ARIADNE_RAM+offsetof(struct lancedata, tx_buff[i])) |
  		  TF_STP | TF_ENP;
  	t->TMD2 = swapw((u_short)-PKT_BUF_SIZE);
  	t->TMD3 = 0;
  	priv->tx_ring[i] = &lancedata->tx_ring[i];
  	priv->tx_buff[i] = lancedata->tx_buff[i];
  #if 0
  	printk(KERN_DEBUG "TX Entry %2d at %p, Buf at %p\n", i,
  	       &lancedata->tx_ring[i], lancedata->tx_buff[i]);
  #endif
      }
  
      /* Set up RX Ring */
      for (i = 0; i < RX_RING_SIZE; i++) {
  	volatile struct RDRE *r = &lancedata->rx_ring[i];
  	r->RMD0 = swloww(ARIADNE_RAM+offsetof(struct lancedata, rx_buff[i]));
  	r->RMD1 = swhighw(ARIADNE_RAM+offsetof(struct lancedata, rx_buff[i])) |
  		  RF_OWN;
  	r->RMD2 = swapw((u_short)-PKT_BUF_SIZE);
  	r->RMD3 = 0x0000;
  	priv->rx_ring[i] = &lancedata->rx_ring[i];
  	priv->rx_buff[i] = lancedata->rx_buff[i];
  #if 0
  	printk(KERN_DEBUG "RX Entry %2d at %p, Buf at %p\n", i,
  	       &lancedata->rx_ring[i], lancedata->rx_buff[i]);
  #endif
      }
  }
  
  
  static int ariadne_close(struct net_device *dev)
  {
      volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
  
      netif_stop_queue(dev);
  
      lance->RAP = CSR112;	/* Missed Frame Count */
      dev->stats.rx_missed_errors = swapw(lance->RDP);
      lance->RAP = CSR0;		/* PCnet-ISA Controller Status */
  
      if (ariadne_debug > 1) {
  	printk(KERN_DEBUG "%s: Shutting down ethercard, status was %2.2x.\n",
  	       dev->name, lance->RDP);
  	printk(KERN_DEBUG "%s: %lu packets missed\n", dev->name,
  	       dev->stats.rx_missed_errors);
      }
  
      /* We stop the LANCE here -- it occasionally polls memory if we don't. */
      lance->RDP = STOP;
  
      free_irq(IRQ_AMIGA_PORTS, dev);
  
      return 0;
  }
  
  
  static inline void ariadne_reset(struct net_device *dev)
  {
      volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
  
      lance->RAP = CSR0;	/* PCnet-ISA Controller Status */
      lance->RDP = STOP;
      ariadne_init_ring(dev);
      lance->RDP = INEA|STRT;
      netif_start_queue(dev);
  }
  
  
  static irqreturn_t ariadne_interrupt(int irq, void *data)
  {
      struct net_device *dev = (struct net_device *)data;
      volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
      struct ariadne_private *priv;
      int csr0, boguscnt;
      int handled = 0;
  
      lance->RAP = CSR0;			/* PCnet-ISA Controller Status */
  
      if (!(lance->RDP & INTR))		/* Check if any interrupt has been */
  	return IRQ_NONE;		/* generated by the board. */
  
      priv = netdev_priv(dev);
  
      boguscnt = 10;
      while ((csr0 = lance->RDP) & (ERR|RINT|TINT) && --boguscnt >= 0) {
  	/* Acknowledge all of the current interrupt sources ASAP. */
  	lance->RDP = csr0 & ~(INEA|TDMD|STOP|STRT|INIT);
  
  #if 0
  	if (ariadne_debug > 5) {
  	    printk(KERN_DEBUG "%s: interrupt  csr0=%#2.2x new csr=%#2.2x.",
  		   dev->name, csr0, lance->RDP);
  	    printk("[");
  	    if (csr0 & INTR)
  		printk(" INTR");
  	    if (csr0 & INEA)
  		printk(" INEA");
  	    if (csr0 & RXON)
  		printk(" RXON");
  	    if (csr0 & TXON)
  		printk(" TXON");
  	    if (csr0 & TDMD)
  		printk(" TDMD");
  	    if (csr0 & STOP)
  		printk(" STOP");
  	    if (csr0 & STRT)
  		printk(" STRT");
  	    if (csr0 & INIT)
  		printk(" INIT");
  	    if (csr0 & ERR)
  		printk(" ERR");
  	    if (csr0 & BABL)
  		printk(" BABL");
  	    if (csr0 & CERR)
  		printk(" CERR");
  	    if (csr0 & MISS)
  		printk(" MISS");
  	    if (csr0 & MERR)
  		printk(" MERR");
  	    if (csr0 & RINT)
  		printk(" RINT");
  	    if (csr0 & TINT)
  		printk(" TINT");
  	    if (csr0 & IDON)
  		printk(" IDON");
  	    printk(" ]\n");
  	}
  #endif
  
  	if (csr0 & RINT) {	/* Rx interrupt */
  	    handled = 1;
  	    ariadne_rx(dev);
  	}
  
  	if (csr0 & TINT) {	/* Tx-done interrupt */
  	    int dirty_tx = priv->dirty_tx;
  
  	    handled = 1;
  	    while (dirty_tx < priv->cur_tx) {
  		int entry = dirty_tx % TX_RING_SIZE;
  		int status = lowb(priv->tx_ring[entry]->TMD1);
  
  		if (status & TF_OWN)
  		    break;	/* It still hasn't been Txed */
  
  		priv->tx_ring[entry]->TMD1 &= 0xff00;
  
  		if (status & TF_ERR) {
  		    /* There was an major error, log it. */
  		    int err_status = priv->tx_ring[entry]->TMD3;
  		    dev->stats.tx_errors++;
  		    if (err_status & EF_RTRY)
  			dev->stats.tx_aborted_errors++;
  		    if (err_status & EF_LCAR)
  			dev->stats.tx_carrier_errors++;
  		    if (err_status & EF_LCOL)
  			dev->stats.tx_window_errors++;
  		    if (err_status & EF_UFLO) {
  			/* Ackk!  On FIFO errors the Tx unit is turned off! */
  			dev->stats.tx_fifo_errors++;
  			/* Remove this verbosity later! */
  			printk(KERN_ERR "%s: Tx FIFO error! Status %4.4x.\n",
  			       dev->name, csr0);
  			/* Restart the chip. */
  			lance->RDP = STRT;
  		    }
  		} else {
  		    if (status & (TF_MORE|TF_ONE))
  			dev->stats.collisions++;
  		    dev->stats.tx_packets++;
  		}
  		dirty_tx++;
  	    }
  
  #ifndef final_version
  	    if (priv->cur_tx - dirty_tx >= TX_RING_SIZE) {
  		printk(KERN_ERR "out-of-sync dirty pointer, %d vs. %d, "
  		       "full=%d.\n", dirty_tx, priv->cur_tx, priv->tx_full);
  		dirty_tx += TX_RING_SIZE;
  	    }
  #endif
  
  	    if (priv->tx_full && netif_queue_stopped(dev) &&
  		dirty_tx > priv->cur_tx - TX_RING_SIZE + 2) {
  		/* The ring is no longer full. */
  		priv->tx_full = 0;
  		netif_wake_queue(dev);
  	    }
  
  	    priv->dirty_tx = dirty_tx;
  	}
  
  	/* Log misc errors. */
  	if (csr0 & BABL) {
  	    handled = 1;
  	    dev->stats.tx_errors++;	/* Tx babble. */
  	}
  	if (csr0 & MISS) {
  	    handled = 1;
  	    dev->stats.rx_errors++;	/* Missed a Rx frame. */
  	}
  	if (csr0 & MERR) {
  	    handled = 1;
  	    printk(KERN_ERR "%s: Bus master arbitration failure, status "
  		   "%4.4x.\n", dev->name, csr0);
  	    /* Restart the chip. */
  	    lance->RDP = STRT;
  	}
      }
  
      /* Clear any other interrupt, and set interrupt enable. */
      lance->RAP = CSR0;		/* PCnet-ISA Controller Status */
      lance->RDP = INEA|BABL|CERR|MISS|MERR|IDON;
  
  #if 0
      if (ariadne_debug > 4)
  	printk(KERN_DEBUG "%s: exiting interrupt, csr%d=%#4.4x.\n", dev->name,
  	       lance->RAP, lance->RDP);
  #endif
      return IRQ_RETVAL(handled);
  }
  
  
  static void ariadne_tx_timeout(struct net_device *dev)
  {
      volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
  
      printk(KERN_ERR "%s: transmit timed out, status %4.4x, resetting.\n",
  	   dev->name, lance->RDP);
      ariadne_reset(dev);
      netif_wake_queue(dev);
  }
  
  
  static netdev_tx_t ariadne_start_xmit(struct sk_buff *skb,
  				      struct net_device *dev)
  {
      struct ariadne_private *priv = netdev_priv(dev);
      volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
      int entry;
      unsigned long flags;
      int len = skb->len;
  
  #if 0
      if (ariadne_debug > 3) {
  	lance->RAP = CSR0;	/* PCnet-ISA Controller Status */
  	printk(KERN_DEBUG "%s: ariadne_start_xmit() called, csr0 %4.4x.\n",
  	       dev->name, lance->RDP);
  	lance->RDP = 0x0000;
      }
  #endif
  
      /* FIXME: is the 79C960 new enough to do its own padding right ? */
      if (skb->len < ETH_ZLEN)
      {
      	if (skb_padto(skb, ETH_ZLEN))
      	    return NETDEV_TX_OK;
      	len = ETH_ZLEN;
      }
  
      /* Fill in a Tx ring entry */
  
  #if 0
  {
      printk(KERN_DEBUG "TX pkt type 0x%04x from %pM to %pM "
  	   " data 0x%08x len %d\n",
  	   ((u_short *)skb->data)[6],
  	   skb->data + 6, skb->data,
  	   (int)skb->data, (int)skb->len);
  }
  #endif
  
      local_irq_save(flags);
  
      entry = priv->cur_tx % TX_RING_SIZE;
  
      /* Caution: the write order is important here, set the base address with
  		the "ownership" bits last. */
  
      priv->tx_ring[entry]->TMD2 = swapw((u_short)-skb->len);
      priv->tx_ring[entry]->TMD3 = 0x0000;
      memcpyw(priv->tx_buff[entry], (u_short *)skb->data, len);
  
  #if 0
      {
  	int i, len;
  
  	len = skb->len > 64 ? 64 : skb->len;
  	len >>= 1;
  	for (i = 0; i < len; i += 8) {
  	    int j;
  	    printk(KERN_DEBUG "%04x:", i);
  	    for (j = 0; (j < 8) && ((i+j) < len); j++) {
  		if (!(j & 1))
  		    printk(" ");
  		printk("%04x", priv->tx_buff[entry][i+j]);
  	    }
  	    printk("\n");
  	}
      }
  #endif
  
      priv->tx_ring[entry]->TMD1 = (priv->tx_ring[entry]->TMD1&0xff00)|TF_OWN|TF_STP|TF_ENP;
  
      dev_kfree_skb(skb);
  
      priv->cur_tx++;
      if ((priv->cur_tx >= TX_RING_SIZE) && (priv->dirty_tx >= TX_RING_SIZE)) {
  
  #if 0
  	printk(KERN_DEBUG "*** Subtracting TX_RING_SIZE from cur_tx (%d) and "
  	       "dirty_tx (%d)\n", priv->cur_tx, priv->dirty_tx);
  #endif
  
  	priv->cur_tx -= TX_RING_SIZE;
  	priv->dirty_tx -= TX_RING_SIZE;
      }
      dev->stats.tx_bytes += len;
  
      /* Trigger an immediate send poll. */
      lance->RAP = CSR0;		/* PCnet-ISA Controller Status */
      lance->RDP = INEA|TDMD;
  
      if (lowb(priv->tx_ring[(entry+1) % TX_RING_SIZE]->TMD1) != 0) {
  	netif_stop_queue(dev);
  	priv->tx_full = 1;
      }
      local_irq_restore(flags);
  
      return NETDEV_TX_OK;
  }
  
  
  static int ariadne_rx(struct net_device *dev)
  {
      struct ariadne_private *priv = netdev_priv(dev);
      int entry = priv->cur_rx % RX_RING_SIZE;
      int i;
  
      /* If we own the next entry, it's a new packet. Send it up. */
      while (!(lowb(priv->rx_ring[entry]->RMD1) & RF_OWN)) {
  	int status = lowb(priv->rx_ring[entry]->RMD1);
  
  	if (status != (RF_STP|RF_ENP)) {	/* There was an error. */
  	    /* There is a tricky error noted by John Murphy,
  		<murf@perftech.com> to Russ Nelson: Even with full-sized
  		buffers it's possible for a jabber packet to use two
  		buffers, with only the last correctly noting the error. */
  	    if (status & RF_ENP)
  		/* Only count a general error at the end of a packet.*/
  		dev->stats.rx_errors++;
  	    if (status & RF_FRAM)
  		dev->stats.rx_frame_errors++;
  	    if (status & RF_OFLO)
  		dev->stats.rx_over_errors++;
  	    if (status & RF_CRC)
  		dev->stats.rx_crc_errors++;
  	    if (status & RF_BUFF)
  		dev->stats.rx_fifo_errors++;
  	    priv->rx_ring[entry]->RMD1 &= 0xff00|RF_STP|RF_ENP;
  	} else {
  	    /* Malloc up new buffer, compatible with net-3. */
  	    short pkt_len = swapw(priv->rx_ring[entry]->RMD3);
  	    struct sk_buff *skb;
  
  	    skb = dev_alloc_skb(pkt_len+2);
  	    if (skb == NULL) {
  		printk(KERN_WARNING "%s: Memory squeeze, deferring packet.\n",
  		       dev->name);
  		for (i = 0; i < RX_RING_SIZE; i++)
  		    if (lowb(priv->rx_ring[(entry+i) % RX_RING_SIZE]->RMD1) & RF_OWN)
  			break;
  
  		if (i > RX_RING_SIZE-2) {
  		    dev->stats.rx_dropped++;
  		    priv->rx_ring[entry]->RMD1 |= RF_OWN;
  		    priv->cur_rx++;
  		}
  		break;
  	    }
  
  
  	    skb_reserve(skb,2);		/* 16 byte align */
  	    skb_put(skb,pkt_len);	/* Make room */
  	    skb_copy_to_linear_data(skb, (char *)priv->rx_buff[entry], pkt_len);
  	    skb->protocol=eth_type_trans(skb,dev);
  #if 0
  {
  	    printk(KERN_DEBUG "RX pkt type 0x%04x from ",
  		   ((u_short *)skb->data)[6]);
  	    {
  		u_char *ptr = &((u_char *)skb->data)[6];
  		printk("%pM", ptr);
  	    }
  	    printk(" to ");
  	    {
  		u_char *ptr = (u_char *)skb->data;
  		printk("%pM", ptr);
  	    }
  	    printk(" data 0x%08x len %d\n", (int)skb->data, (int)skb->len);
  }
  #endif
  
  	    netif_rx(skb);
  	    dev->stats.rx_packets++;
  	    dev->stats.rx_bytes += pkt_len;
  	}
  
  	priv->rx_ring[entry]->RMD1 |= RF_OWN;
  	entry = (++priv->cur_rx) % RX_RING_SIZE;
      }
  
      priv->cur_rx = priv->cur_rx % RX_RING_SIZE;
  
      /* We should check that at least two ring entries are free.	 If not,
         we should free one and mark stats->rx_dropped++. */
  
      return 0;
  }
  
  
  static struct net_device_stats *ariadne_get_stats(struct net_device *dev)
  {
      volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
      short saved_addr;
      unsigned long flags;
  
      local_irq_save(flags);
      saved_addr = lance->RAP;
      lance->RAP = CSR112;		/* Missed Frame Count */
      dev->stats.rx_missed_errors = swapw(lance->RDP);
      lance->RAP = saved_addr;
      local_irq_restore(flags);
  
      return &dev->stats;
  }
  
  
  /* Set or clear the multicast filter for this adaptor.
      num_addrs == -1	Promiscuous mode, receive all packets
      num_addrs == 0	Normal mode, clear multicast list
      num_addrs > 0	Multicast mode, receive normal and MC packets, and do
  			best-effort filtering.
   */
  static void set_multicast_list(struct net_device *dev)
  {
      volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
  
      if (!netif_running(dev))
  	return;
  
      netif_stop_queue(dev);
  
      /* We take the simple way out and always enable promiscuous mode. */
      lance->RAP = CSR0;			/* PCnet-ISA Controller Status */
      lance->RDP = STOP;			/* Temporarily stop the lance. */
      ariadne_init_ring(dev);
  
      if (dev->flags & IFF_PROMISC) {
  	lance->RAP = CSR15;		/* Mode Register */
  	lance->RDP = PROM;		/* Set promiscuous mode */
      } else {
  	short multicast_table[4];
  	int num_addrs = netdev_mc_count(dev);
  	int i;
  	/* We don't use the multicast table, but rely on upper-layer filtering. */
  	memset(multicast_table, (num_addrs == 0) ? 0 : -1,
  	       sizeof(multicast_table));
  	for (i = 0; i < 4; i++) {
  	    lance->RAP = CSR8+(i<<8);	/* Logical Address Filter */
  	    lance->RDP = swapw(multicast_table[i]);
  	}
  	lance->RAP = CSR15;		/* Mode Register */
  	lance->RDP = 0x0000;		/* Unset promiscuous mode */
      }
  
      lance->RAP = CSR0;			/* PCnet-ISA Controller Status */
      lance->RDP = INEA|STRT|IDON;	/* Resume normal operation. */
  
      netif_wake_queue(dev);
  }
  
  
  static void __devexit ariadne_remove_one(struct zorro_dev *z)
  {
      struct net_device *dev = zorro_get_drvdata(z);
  
      unregister_netdev(dev);
      release_mem_region(ZTWO_PADDR(dev->base_addr), sizeof(struct Am79C960));
      release_mem_region(ZTWO_PADDR(dev->mem_start), ARIADNE_RAM_SIZE);
      free_netdev(dev);
  }
  
  static int __init ariadne_init_module(void)
  {
      return zorro_register_driver(&ariadne_driver);
  }
  
  static void __exit ariadne_cleanup_module(void)
  {
      zorro_unregister_driver(&ariadne_driver);
  }
  
  module_init(ariadne_init_module);
  module_exit(ariadne_cleanup_module);
  
  MODULE_LICENSE("GPL");
  